Honestly, I feel the Sword of Nunoboku is pure nonsense at this point.
- Hagoromo didn’t “create” the world with it. Earth/Humanity Existed long before he was even thought of.
- Chakra existed within Humanity before Kaguya/Isshiki came (It was the reason they came).
- He was comfortably stronger than Naruto & Sasuke sans his wavering will. Destroying the world just to kill them was antithetical to his entire life’s plan, nor has he ever been presented as unhinged like that.
Quite frankly, I believe it to be a stupid assertion. How can it destroy something it was never used to create in the first place? Kishimoto contradicted the sword there. And the idea that Obito destroy the world in that moment is pure boof. Nothing supports or justifies the Sword of Nunoboku being able to do that.
Juubito already scales over comfortably over Madara / Hashirama (Idk if my CRT about the scaling was ever applied but we had the debate forsure and it passed).